Method for pumping hot liquids



Dec. 9, 1924- 7 1,518,456

P. ROTH METHOD FOR PUMPING HOT LIQUIDS Filed June 17, 1924 Peczro BothPatented Dec. 9, 1924.

PTENT PEDRO ROTH, OF BUENOS AIRES, ARGENTINA.

METHOD FOR PUMPING HOT LIQUIDS.

Application filed June 17, 1924. Serial No. 720,639.

To all whom it may concern:

Be it known that I, PEnRo Ro'rI-r, citizen of the Republic of Argentina,residing at de Mayo Street, Buenos Aires, Argentina, have inventedcertain newand use- 't'ul improvements in Methods for Pumping HotLiquids, of which the following is a specification.

My invention relates to a new method for pumping hot liquids, its objectbeing to provide asimple and economical means by which the drawbacksincident to these operations when. using the known methods are easilyeliminated.

The pumping of liquids at high temperatures involves considerabledrawbacks and difficulties as heretofore carried out, and the problem,although very well known, has not found a satisfactory and completesolution.

According to my invention, all these drawbacks are easily obviated insuch a manner that the pumping of liquids at very high temperaturesbecomes as easy an operation as in the case of liquids having normaltemperatures.

The main feature of my invention consists in omitting the piston of theordinary pumps and in utilizing, within the body of the pump, a fractionof the potential energy of the liquid at high temperature to vaporize acertain amount of another liquid having a boiling point lower than thetemperature at which the liquid to be pumped stands. In this way, thevapors so generated act as a piston to move the liquid mass containedwithin the body of the pump.

In order that my invention be clearly understood and easily carried intopractice, reference will now be made to the appended diagrammaticdrawing showing a partsectional front view of one of the possibleembodiments of said invention.

in the said drawing, 1 is a pump body having an inlet 2 and an outlet 3with the corresponding valves 6 and 9. 4 is a pipe with a blow-oft valve8, and 5 an injector with the corresponding valve 7 The operation of thedevice is as follows By its own weight or due to the pressure to whichit is subjected, the hot liquid to be pumped enters the body of the pump1 through the check valve 6. During this period of the cycle, thevalve-s 9 and 7 are closed and the blow-off pipe 8 is open.

The valve 7 of the injector 5 is then opened and a suitable amount ofthe liquid to be vaporized is injected therethrough. Said liquid willthen absorb heat from the liquid at high temperature within the body ofthe pump, and on passing into gaseous state will exert thereon apressure by which the liquid mass will be forced through the valve 9 andthe outlet 3. The check valve 6 and the blow-off valve 8 will be closedduring this period of the cycle.

After this, the valve 8 is opened, whereby the vapors within the pumpbody will escape through the pipe 4c- The valves 7 and 9 are thenclosed. The cycle of operations is thus completed and the pump is readyto receive a new charge of liquid at high temperature.

The synchronism of the valves in their operation and the injection ofthe liquid to be vaporized may be obtained by any suitable meansindependently of the inveir tion proper, the scope of which ishereinafter specifically claimed.

Having now fully described and ascertained the nature of my presentinvention and in what manner the same is to be carried into practice, Ideclare that what I claim and desire to protect by Letters Patent is Amethod of pumping liquids at high temperatures, which consists inintroducing the hot liquid into a closed receptacle having an inlet andan outlet for such liquid; and thereafter injecting into said receptaclea different liquid having a boiling point lower than the prevailingtemperature of the first liquid, whereby the second liquid will bevaporized by direct contact with the first liquid, and the vapors sogenerated will form a gaseous piston which acts directly against saidfirst liquid to expel it through, the outlet.

In testimony whereof I aflix my signature,

PEDRO ROTH.

